What library must be included to use the strcpy() function in C?

What library must be included to use the strcpy() function in C?

• A. stdlib.h
• B. string.h
• C. stdio.h
• D. math.h

Answer: (B)

To use the strcpy() function in C, the appropriate library to include is string.h. This library contains the declarations for string-handling functions, including strcpy(), which is used to copy a string from one location to another. Including string.h ensures that the compiler recognizes the strcpy() function and allows you to use it correctly in your program. Without this library, you would encounter an "implicit declaration" warning and potential errors when trying to compile your code. The other libraries listed do not contain string manipulation functions; stdlib.h is primarily for standard utility functions, stdio.h deals with input and output operations, and math.h includes mathematical functions. Thus, none of them provide access to the string functions you need for tasks such as copying strings.

To use the strcpy() function in C, the appropriate library to include is string.h. This library contains the declarations for string-handling functions, including strcpy(), which is used to copy a string from one location to another.

Including string.h ensures that the compiler recognizes the strcpy() function and allows you to use it correctly in your program. Without this library, you would encounter an "implicit declaration" warning and potential errors when trying to compile your code.

The other libraries listed do not contain string manipulation functions; stdlib.h is primarily for standard utility functions, stdio.h deals with input and output operations, and math.h includes mathematical functions. Thus, none of them provide access to the string functions you need for tasks such as copying strings.